Best LS Car Intake Manifolds for Cathedral Port Heads
When upgrading an LS-based engine, choosing the right cathedral-port intake manifold can significantly impact power, throttle response, and air flow consistency. This guide reviews five relevant options, highlighting compatibility with LS1/LS2/LS6 engines, inlet sizes, materials, and key features. Whether you’re building a street performer or a track-ready machine, this overview helps you compare performance gains and installation considerations.
| Product | Brand | Inlet Size | Material |
|---|---|---|---|
| Htostar Racing For LS Intake Manifold (102mm) | Htostar Racing | 102mm | Aluminum |
| GSTP For LS Cathedral Port (92mm Black) | GSTP | 92mm | Aluminum |
| Htostar Racing For LS Intake Manifold (92mm) | Htostar Racing | 92mm | Aluminum |
| GSTP For LS Cathedral Port (92mm Silver) | GSTP | 92mm | Aluminum |
| YIUIY For LS Cathedral Port (102mm) | YIUIY | 102mm | Aluminum |
Htostar Racing 102mm LS Intake Manifold
The Htostar Racing 102mm LS intake manifold targets cathedral-port LS engines, including LS1, LS2, and LS6 with drive-by-cable throttle bodies. It uses a 1/8″ thick T6061 aluminum construction and provides vacuum ports with plugs and a rear MAP port for a 10 MAP sensor. This manifold is designed for 4-bolt cable-driven throttle bodies and is compatible with several GM models such as Corvette, TrailBlazer SS, and CTS-V variants. The 102mm inlet supports a higher air volume suitable for performance builds.
GSTP 92mm Cathedral Port LS Manifold (Black)
GSTP’s 92mm cathedral-port LS manifold is built for LS1/LS2/LS6 engines with cathedral ports, including 4.8L, 5.3L, 5.7L, and 6.0L variants. It features a taller 210mm height and 1/8″ thick aluminum, plus multiple vacuum ports (1/4NPT and 1/8NPT) with plugs. A rear MAP port and 8AN fuel-rail fittings are included, and an upgraded fuel rail bracket simplifies installation on LS1/LS6/LS2 configurations. This option balances compact size with robust airflow for street and moderate performance applications.
Htostar Racing 92mm LS Intake Manifold (Cathedral Port)
This Htostar Racing manifold is sized at 92mm inlet, designed for cathedral-port heads on LS-based engines with drive-by-cable throttle bodies. It shares similar construction with the 102mm variant, using aluminum with 210mm height. Compatible model notes align with Corvette, Z06, SSR, TrailBlazer SS, CTS-V, Firebird/Trans Am, GTO, and Saab 9-7X Aero lineups. The product aims to deliver improved airflow while maintaining fitment on stock or lightly modified LS assemblies.
GSTP 92mm Cathedral Port LS Manifold (Silver)
This GSTP 92mm silver variant mirrors the black version with cathedral-port compatibility for LS1/LS2/LS6 engines. It emphasizes a composed 92mm inlet, a 210mm tall profile, and a 1/8″ thick aluminum build. It includes vacuum ports and a rear MAP port along with 8AN fuel-rail fittings and an upgraded fuel rail bracket. Suitable for LS-based EFI engines, it appeals to enthusiasts seeking reliable airflow and straightforward mounting without excessive modification.
YIUIY Cathedral Port LS Intake Manifold (102mm, Black)
YIUIY’s 102mm cathedral-port manifold is constructed from 1/8″ thick T6061 aluminum, TIG-welded for strength. It is designed for LS1/LS2/LS6 heads and is compatible with Chevrolet, GMC, and Pontiac models that use cathedral port configurations. The 102mm inlet supports higher air throughput, which can contribute to improved high-RPM performance while maintaining compatibility with common LS swap platforms documented for Corvette, Z06, SSR, and CTS-V variants.
Buying Guide
Key considerations when selecting an LS cathedral-port intake manifold include: engine compatibility, port design, and throttle body drive type. Cathedral-port manifolds are best suited for LS engines with cathedral-port heads and are typically paired with 4-bolt intakes using cable drive throttles. Inlet size influences power potential; larger 102mm manifolds can maximize top-end flow but may require tuning and ancillary fitment checks. Material matters too; aluminum manifolds offer light weight and heat dissipation, while construction quality (welds, ports, and vacuum ports) affects reliability under boost or high RPMs.
- Port compatibility: Confirm the manifold is designed for cathedral-port LS heads (LS1/LS2/LS6 family). Avoid non-compatible port types unless you plan major head work.
- Throttle body drive: If your setup uses a drive-by-wire system, these options may not fit; most listed items are designed for drive by cable configurations.
- Inlet size and height: 92mm vs 102mm affects airflow and clearance. Taller manifolds may require upgraded fuel rails and hood clearance checks.
- Fuel rails and bracketing: Some manifolds include upgraded brackets or require minimal spacers. Verify compatibility with your injector layout and fuel system.
- Installation compatibility: Check for compatibility with your model year range (Corvette, GTO, CTS-V, Firebird, etc.) and ensure there are no conflicts with existing vacuum ports or MAP sensor locations.
Performance expectations vary: 92mm and 102mm variants offer different balances between mid-range torque and top-end power. For naturally aspirated builds, large-inlet manifolds can improve peak airflow, while in boosted setups, verify that the intake’s flow characteristics align with your turbo or supercharger configuration. Always pair a new manifold with appropriate fuel rails, gaskets, and compatible throttle bodies to avoid vacuum leaks or sensor misreads that degrade performance.